270 



PLANT STKUCTUEES 



gcea), wintergreen (Gaultheria), heather {Calluna), moun- 

 tain laurel {Kalmia), Azalea, Rhododendron (Fig. 256), 

 Indian pipe {Monotropa), etc. 



Fig. 255, Flowers of heath plants {Erica), showing complete flowers (A), the sta- 

 mens with " two-horned " anthers which discharge pollen through terminal pores, 

 and the lohed syncarpous ovary with single style and prominent terminal stigma 

 (23, C, i)).— After Drude. 



145. Convolvulus fonns. — The well-known morning-glory 

 (Ipomoea) (Fig. 309) may be taken as a type of the Convol- 



